CN112051079A - Bridge girder erection machine load test method - Google Patents

Abstract

The invention relates to a bridge girder erection machine load test method, which comprises the steps of selecting 3 continuous piers, supporting front and rear support legs of a bridge girder erection machine on the front and rear piers, and moving a crown block of the bridge girder erection machine above a middle pier; an upper counter-force beam and a lower counter-force beam are respectively arranged at the top and the bottom of the bent cap of the middle pier along the bridge direction and are tensioned by a pull rod; a shoulder pole beam is arranged on the upper counter-force beam, a through jack is arranged on the shoulder pole beam, and an anchoring rod is vertically arranged among the upper counter-force beam, the shoulder pole beam and the jack in a penetrating manner; and a crown block of the bridge girder erection machine is connected with two ends of the shoulder pole beam through two steel wire ropes and lifts the shoulder pole beam upwards, the reading of an oil meter of the crown block is observed, and when the designed load is reached, if the bridge girder erection machine is not abnormal, the load test of the bridge girder erection machine is completed. The loading force value of the invention can be directly observed from the oil meter reading of the jack, the test data is accurate, and the safety of the test process is high.

Description

Bridge girder erection machine load test method

Technical Field

The invention belongs to the technical field of bridge construction, and relates to a method for testing the load of a bridge girder erection machine before the bridge girder erection machine is adopted to perform prefabricated T-beam erection.

Background

The bridge girder erection machine is bridge girder erection equipment for lifting and hanging a prefabricated T-shaped girder and erecting the T-shaped girder on a pier. In order to ensure construction safety, the bridge girder erection machine needs to be checked for load capacity before being used for actual construction. The conventional bridge girder erection machine load testing method is to carry out a girder lifting test, namely, a girder section to be erected in actual construction is lifted to test the load of the bridge girder erection machine, and the method can achieve the consistency of the test load and the actual construction load, but has the following defects:

1. the test can be carried out only after the T beam is prefabricated and transported to a construction site, and the load test and the T beam prefabrication can not be carried out synchronously, so that the construction progress is influenced;

2. because the weight of the T beam is fixed, the loading weight cannot be adjusted in the test process, so that the test data is incomplete; and poses a greater safety risk once the weight of the beam exceeds the loading capacity of the bridge girder erection machine.

Disclosure of Invention

The invention aims to provide a bridge girder erection machine load test method independent of a T beam, aiming at the problems of the existing bridge girder erection machine load test method, which is beneficial to ensuring the construction progress, improving the inspection precision and reducing the construction risk.

The technical scheme of the invention is as follows:

a bridge girder erection machine load test method is characterized by comprising the following steps:

(1) selecting 3 continuous piers, supporting front and rear support legs of a bridge girder erection machine on the front and rear piers, and moving a crown block of the bridge girder erection machine to be above a middle pier;

(2) an upper counter-force beam and a lower counter-force beam are respectively arranged at the top and the bottom of a bent cap of the middle pier along the bridge direction, wherein the bottoms of the two ends of the upper counter-force beam are respectively provided with a pad beam, so that a certain distance is reserved between the middle of the upper counter-force beam and the top surface of the bent cap, and the end parts of the upper counter-force beam and the lower counter-force beam are tensioned through a pull rod;

(3) a shoulder pole beam is arranged on the upper counter-force beam in the transverse bridge direction, a through jack is arranged on the shoulder pole beam, an anchoring rod vertically penetrates through the upper counter-force beam, the shoulder pole beam and the jack, the lower end of the anchoring rod is fixed at the bottom of the upper counter-force beam through a nut, and the upper end of the anchoring rod is fixed at the top of a piston of the jack through a nut;

(4) two annular steel wire ropes are connected to an overhead traveling crane of the bridge girder erection machine, and the lower ends of the two steel wire ropes are respectively sleeved at the two ends of the carrying pole beam;

(5) and starting the crown block to lift the carrying pole beam upwards, starting the jack simultaneously, observing the reading of an oil meter of the jack, stabilizing for a period of time when the designed load is reached, and observing whether the bridge girder erection machine is normal or not, wherein if no abnormity exists, the crown block unloads the loading force, and the bridge girder erection machine load test is completed.

The invention provides loading force by a bridge girder erection machine crown block, a loading force transmission system consists of a shoulder pole beam, a jack, an anchoring rod, an upper counter-force beam, a pull rod and a lower counter-force beam, the loading force of the crown block is transmitted to a capping beam, and the capping beam provides counter-force; compared with the existing lifting beam loading method, the load test can be synchronously performed with T beam prefabrication, so that the construction period is guaranteed; the loading force value can be directly observed from the oil meter reading of the jack, the loading test data is accurate, the test load size is controllable, and the test safety is favorably ensured.

Drawings

FIG. 1 is a schematic structural diagram of a load test system of a bridge girder erection machine along the bridge direction;

FIG. 2 is a schematic diagram of a transverse bridge structure of the bridge girder erection machine load test system at a middle bridge pier.

Detailed Description

As shown in fig. 1 and fig. 2, the specific implementation of the present invention is as follows:

(1) selecting 3 continuous piers 1, hoisting a bridge girder erection machine 2 to the front pier and the rear pier through a crane, supporting front and rear support legs of the bridge girder erection machine on cover beams of the front pier and the rear pier, and moving a crown block 3 of the bridge girder erection machine above a middle pier;

(2) an upper counter-force beam 5 and a lower counter-force beam 6 are respectively arranged at the top and the bottom of a bent cap 4 of the middle pier along the bridge direction, wherein pad beams 7 are respectively arranged at the bottoms of two ends of the upper counter-force beam 5, so that a certain distance is reserved between the middle of the upper counter-force beam 5 and the top surface of the bent cap 4, and an anchoring rod is convenient to penetrate through; the end parts of the upper counter-force beam and the lower counter-force beam are tightened through a pull rod 8;

(3) a carrying pole beam 9 is arranged on the upper counter-force beam in the transverse bridge direction, a through type jack 10 is arranged on the carrying pole beam, an anchoring rod 11 vertically penetrates through the upper counter-force beam, the carrying pole beam and the jack, the lower end of the anchoring rod 11 is fixed at the bottom of the upper counter-force beam 5 through a nut, and the upper end of the anchoring rod 11 is fixed at the top of a piston of the jack 10 through a nut;

(4) two annular steel wire ropes 12 are connected to an overhead traveling crane of the bridge girder erection machine, and the lower ends of the two steel wire ropes 12 are respectively sleeved at two ends of the carrying pole beam 9;

(5) starting the crown block 3 to lift and pull the carrying pole beam 9 upwards, simultaneously starting the jack, transmitting the lifting force of the crown block to the capping beam 4 through the carrying pole beam 9, the jack 10, the anchoring rod 11, the upper counter-force beam 5, the pull rod 8 and the lower counter-force beam 6 in sequence, and providing counter-force by the capping beam; observing the reading of the jack oil meter; and if the bridge girder erection machine is abnormal in the loading process, the loading is stopped in time, the bridge girder erection machine is stabilized for a period of time when the designed load is reached, whether the bridge girder erection machine is normal or not is observed, and if the bridge girder erection machine is not abnormal, the crown block unloads the loading force, so that the load test of the bridge girder erection machine is completed.

Claims (1)

1. A bridge girder erection machine load test method is characterized by comprising the following steps:

(1) selecting 3 continuous piers, supporting front and rear support legs of a bridge girder erection machine on the front and rear piers, and moving a crown block of the bridge girder erection machine to be above a middle pier;

(2) an upper counter-force beam and a lower counter-force beam are respectively arranged at the top and the bottom of a bent cap of the middle pier along the bridge direction, wherein the bottoms of the two ends of the upper counter-force beam are respectively provided with a pad beam, so that a certain distance is reserved between the middle of the upper counter-force beam and the top surface of the bent cap, and the end parts of the upper counter-force beam and the lower counter-force beam are tensioned through a pull rod;

(3) a shoulder pole beam is arranged on the upper counter-force beam in the transverse bridge direction, a through jack is arranged on the shoulder pole beam, an anchoring rod vertically penetrates through the upper counter-force beam, the shoulder pole beam and the jack, the lower end of the anchoring rod is fixed at the bottom of the upper counter-force beam through a nut, and the upper end of the anchoring rod is fixed at the top of a piston of the jack through a nut;

(4) two annular steel wire ropes are connected to an overhead traveling crane of the bridge girder erection machine, and the lower ends of the two steel wire ropes are respectively sleeved at the two ends of the carrying pole beam;

(5) and starting the crown block to lift the carrying pole beam upwards, starting the jack simultaneously, observing the reading of an oil meter of the jack, stabilizing for a period of time when the designed load is reached, and observing whether the bridge girder erection machine is normal or not, wherein if no abnormity exists, the crown block unloads the loading force, and the bridge girder erection machine load test is completed.

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